Test Solutions for DisplayPort 1.2 Automated Conformanceand Embedded DisplayPort Conformance Datasheet

Features & Benefits

• Speeds Up Test Time – No user interaction is required to change source output signal or validate sink silicon state or error count
• Automates DisplayPort 1.2 Physical Layer Testing
• Fully Integrated with DisplayPort Physical Layer Source Automation Software (Option DP12)
• Stand-alone GUI provides Flexibility to Perform DisplayPort Tests without Automation Software
• No Need to Learn Vendor-specific Software – A single GUI supports all vendors
• View Decoded AUX Traffic and Hot Plug Detect (HPD) Events from the Device Under Test to the DP-AUX DisplayPort AUX Controller
• Ability to Read and Write DPCD Registers supports Debug Activities
• USB Interface enables the DP-AUX to run on a PC, Oscilloscope, or Arbitrary Waveform Generator
• Option eDP provides dynamic mask generation to ensure proper testing

Applications

• DisplayPort/eDP Debug, Characterization, and Compliance for:
  • Silicon Validation
  • Computer System Validation and Integration

Complete Automation for DisplayPort Testing

The Tektronix DP12 software, combined with a DisplayPort AUX controller automates DisplayPort physical layer source compliance testing. DP-AUX eliminates the need for user interaction during testing and the need to use vendor-specific proprietary software. Engineers can simply select the desired tests to run and work on other tasks while the tests are being executed. The DP-AUX stand-alone GUI can also be used in validation, debug, and characterization of DisplayPort Source and Sink devices.

DP-AUX connects using USB to a PC, Tektronix DPO/DSA/MSO70000 Series (8 GHz minimum) oscilloscope, or BERTScope BSA85C Bit Error Rate Analyzer and connects directly to the DisplayPort Plug Test Fixture (TF-DP-TPA-P) and the DisplayPort Receptacle Test Fixture (TF-DP-TPA-R). The AUX channel connects through SMA connectors on the DP-AUX to the SMA connectors on the DisplayPort test fixture. The Hot Plug Detect line connects from the 4-pin header on the DisplayPort test fixture to the DP-AUX Auxiliary Controller using the included hot-plug cable.

The DP12 Physical Layer Measurement and Automation system from Tektronix is a performance (8 GHz and higher) oscilloscope software application option designed to perform the core measurements found in the DisplayPort Version 1.2 Compliance Test Specification or CTS.

The VESA DisplayPort 1.2 specification adds a new series of compliance test specifications which supersedes the legacy DP1.1a specification. A third speed grade of higher performance, DP1.2 introduces a new higher data rate of 5.4 Gb/s known as HBR2 speed. This allows for increased resolutions, higher refresh rates, and greater color depth. Other improvements include multiple independent video streams (daisy-chain connection with multiple monitors) and support for stereoscopic 3D media.

The Version 1.2 CTS outlines 17 transmitter physical layer validation tests which are typically evaluated with an 8 GHz or higher bandwidth oscilloscope.

Source Test Suite:

• EYE Diagram
• Non Pre-emphasis Level Verification
• Pre-emphasis Level and Post-cursor2
• Inter-pair Skew
• Intra-pair Skew
• Differential Transition Time
• Single-ended Rise and Fall Time Mismatch
• Overshoot and Undershoot Test
• Frequency Accuracy
• AC Common Mode Noise
• Non-ISI Jitter Measurement
• Total Jitter and Random Jitter Measurement
• Unit Interval
• Main Link Frequency Compliance Stability
• Spread Spectrum Modulation Frequency
• Spread Spectrum Deviation
• dF/dt Spread Spectrum Deviation HF Variation

 

DisplayPort Sources (transmitters) have state control requirements in order to transmit the data patterns and signal properties required to demonstrate conformance to the Compliance Test Specification.

The following properties and patterns need to be transmitted for full measurement coverage:

• Bit Rates: RBR, HBR, or HBR2
• Data Patterns: D10.2, PRBS7, COMP, PLTPAT, PCTPAT
• FFE (Pre-emphasis): 0 dB, 3.5 dB, 6 dB, 9.5 dB
• Output Levels: 400 mV, 600 mV, 800 mV, 1200 mV
• SSC (Spread Spectrum): On/Off
• Post-curser2: Level 0, 1, 2, 3

 

These states can be either controlled manually (key during early silicon turn-on) or with a Tektronix DP-AUX controller. This control accessory interacts with the DUT’s DPCD registers to automate the extensive number of measurements required to comprehensively test all 4 DisplayPort lanes. The DP-AUX controller can read and write DPCD registers directly, supporting both physical-layer and digital validation and debug.

A full-featured DP 1.2 device requires 432 acquired signals to completely test all elements of the silicon per lane. X4 lanes results in 1728 automated acquisitions per DUT.

Receiver Testing for DisplayPort 1.2

For receiver test verification in the DisplayPort 1.2 spec, Tektronix recommends the use of a BERTScope BSA85C Bit Error Rate Analyzer. When this product is properly set up, it can generate a calibrated level of crosstalk to stress a DisplayPort receiver. The BSA85C, in conjunction with the Interconnect Compliance Channel fixturing from Tektronix, will generate a known amount of ISI, RJ, and TJ at different frequencies to enable proper stress levels on the design’s receiver. Once the crosstalk is applied to the test pattern, the BERTScope can measure the final eye width expected without crosstalk. Then a measurement can be made at each frequency with crosstalk applied and compared with the results above.

DP-AUX for DisplayPort 1.2 Test System Support

Recommended Accessory DP-AUX.

The DP-AUX system is a vital component to support the debug or automated testing of DisplayPort systems. The DP-AUX system interfaces to either a DisplayPort Source or Sink device’s auxiliary channels and hot-plug detect system to permit full access to the internal DPCD registers.

DP-AUX Source Test.

The DP-AUX Source Test tab permits full DPCD-based control of the three DP 1.2 bit rates (1.6, 2.7, and 5.4 Gb/s) as well as the broadcast patterns and transmitter attributes.

DP-AUX Sink Test.

The Sink Test facilities in the DP-AUX system permit DPCD-based interaction with a Sink (receiver) based error detection system to permit evaluation of receiver’s conformance status to impaired compliance test signals or for determining device margin.

The DP-AUX sets the receiver up to receive the frequency lock and symbol lock patterns to validate that link training was successful. This then enables users to conduct the receiver testing in-line with the Version 1.2 Compliance Test Specification.

DP-AUX Debug.

User-level debug which permits direct DPCD register read/write operations as well as monitoring AUX-level protocol traffic, offers a unique level of transaction and link training monitoring options.

The DP-AUX accessory can be loaded on any Windows XP or Windows 7 PC, however it’s typically resident on the instrument as a control agent for the DP 1.2 measurement and automation system.

The DP12 performance instrument option for DSA70000 Series oscilloscopes offers a comprehensive DisplayPort Version 1.2 Physical Layer Conformance Verification and Automation system.

Features:

• User-defined Automation or Custom Controls of the Device States
• Variable Test Controls based on the Product’s Intrinsic Capabilities
  • RBR, HBR, or HBR2 Speed Selections
  • Voltage Swing: 400-1200 mV
  • Post-cursor2 Levels
  • Pre-emphasis Controls
  • Test Pattern Selection
• 1, 2, or 4-lane Configurations
• Full Test Pattern Validation Controls

 

DP-AUX Characteristics

Physical Characteristics

Cable	cm	in.
USB Type A to Type B Cable Length	91.44	36
SMA to SMA Cable Length	200	78.74
Hot Plug Cable Length	96.42	38
Dimension	mm	in.
Height	27.3	1.075
Width	78.1	3.075
Depth	123.2	4.85

DUT Setup Panel for DP12.

The DP12 transmitter test solution can be configured for 3 different signal input configurations, listed below:

P7313SMA.

• P7313SMA differential probe based input, which offers the most efficient test configuration, by offering inputs for all 4 differential DisplayPort signals concurrently. This configuration precludes the testing of common mode and skew measurements

TCA Inputs.

• TCA-based single-ended input (direct Tektronix oscilloscope inputs) supports both differential and single-ended tests including intra-pair skew measurements on up to 2 concurrent DisplayPort signals

This RF switch configuration permits comprehensive and fully automated 4-lane input testing of all DisplayPort input channels, including all common mode and intra-/inter-pair skew measurements.

• Keithley RF Switch 12:4 Mux Input.Part Number: KEITHLEY SYSTEM 46Model Number: S46T – BBBB0000UUUUA

Full CTS 1.2 conformant measurement list tailored to the user-specified DUT capabilities.


Comprehensive user-defined and configurable .MHTL report generation with variable degrees of report detail and full append capability.


Receiver Testing for DisplayPort.

Embedded DisplayPort solution

Option EDP is designed to provide component and system designers with a comprehensive verification and debug solution the latest Embedded DisplayPort Specification 1.4. Using the familiar DPOJET look and feel the user can select the setup based on their specific measurements requirements. In addition, as the 1.4 specification allows the data rate to be anywhere within a range of speeds from RBR to HBR2 rates, opt EDP will provide the dynamic mask generation required to ensure proper testing.

 

Tektronix supports multiple probing solutions for eDP designs. The one of the two common will be a soldered-in probe where the target DUT does not have a connection for a fixture. The second common method is using an eDP test fixture with P7300 SMA Probes. Either one of these two methods will allow for complete four lane testing when using four probes. One additional method the user will have is the direct connections to the fixture with SMA cables. This method allows the user to test one or two lanes at once.

eDP standard tab

eDP source measurements:

• Test 3.1 - Eye Diagram Test
• Test 3.2 - Inter Pair Skew test
• Test 3.3 - Non-ISI Jitter Measurements
• Test 3.4 - Total Jitter
• Test 3.5 - Deterministic jitter
• Test 3.6 - Random Jitter
• Test 3.7 - Main Link Frequency Stability
• Test 3.8 - Spread Spectrum Modulation Frequency
• Test 3.9 - Spread Spectrum Modulation Deviation

Eye diagram


HBR2 eye results

Oscilloscope Requirements

Option EDP requires a DPO/DSA/MSO 70K scope running firmware version 6.4.0 or higher and DPOJet version 6.0 or higher.

For customers testing RBR (1.62 Gb/sec) and HBR (2.7 Gb/sec) a minimum bandwidth of 8Ghz is required.

For customers testing HBR2 (5.4 Gb/sec) a minimum 12.5GHz BW is required.

Probing

For customers testing RBR (1.62 Gb/sec) or HBR (2.7 Gb/sec) Qty 4 P7380 or P7380SMA are required if testing more then two lanes at one time.

For customers testing HBR2 (5.4 Gb/sec) and HBR (2.7 Gb/sec) and RBR (1.62 Gb/sec) Qty 4 P7313 or P7313MA are required if testing more then two lanes at one time.

An optional eDP fixture is available on the Tektronix PAL:

eDP fixtures